Formula: KNa4Ca4(Si,Al)16O36(OH)4 . 6H2O
Origin of name: For E. Federov, Russian mineralogist
Crystal system: Triclinic
Crystal class: -1
Twinning:
Unit cell:
Colour: Colourless to pale raspberry red
Diaphaneity:
Luster: Vitreous
Habit: Crystals tabular pseudohexagonal, resemble Muscovite
Hardness:
Specific gravity: 2.43
Cleavage: 1; {001} micaceous
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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